Sylvania



(No Model.)

H. H. HOLLISTER & T. H. HULL.

HARROW.

No. 417,183, Patented Dec. 10, 1889..

XXL/M21210,

UNITED STATES PATENT OFFICE.

IIERSCI-IEII II. IIOLLISTER AND THOMAS ll. HULL, OF SCRANTON, PENN- SYLVANIA.

HARROW.

SPECIFICATION forming part of Letters Patent No. 417,183, dated December 10, 18819.

Application filed June 1, 1889- Serial No, 312,360. (No mbdel.)

To all whom it may concern.-

Be it known that we, HERSCHEL H. HOLLIS TER and THOMAS H. HULL, citizens of the United States, residing at Scranton, in the county of Lackawanna and State of Pennsylvania, have invented certain new and useful Improvements in Ilarrows; and we do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form a part of this specification.

Our invention relates to harrows for leveling and pulverizing the soil, and has particular reference to the form usually known as a springtooth.

The frame of the harrow is formed of metal tubing, preferably gas-pipe, and may be made in sections, which are hinged and folded together. The frame is equipped with a suitable number of cross-bars to make the desired number of rows of teeth. The teeth are secured to one cross-bar at the forward end and carried back past the next adjoining bar, to which they are secured in a suitable manner, and from which they are sprung into suitable shape to form the raking or pulverizing portion of the tooth. The connection with the forward cross-bar is made by clamping the strap metal of the tooth around it, and the connection to the next adjoining bar is preferably made by forming a partial loop in the tooth, inserting such looped portion in a cut in the tubing and passing a pin or wire through the loop and tubing. In this way all the teeth which are attached at their second point to one bar are held by the same pin or wire. Teeth to be sprung from the third cross-bar can have their front ends clamped on the second crossbar, and so on. Instead of being looped in to the tubing, the teeth may be clamped thereto by a suitable clamp set in any convenient way to clamp both the tooth and the bar, as a screw let through the top of the bar, and in this form the teeth may be short and not extended to the bar in ad Vance. The parts of the frame are united by ordinary T and corner couplings, so that the we consider the best means for carrying our invention into practice.

Figure 1 is a plan view of a square harrow. Fig. 2 is a plan View of a butterfly harrow. Fig. 3 is a section of two bars, showing a tooth applied. Fig. 4 is a section of a bar, showing a tooth screwed fast to it.

Similar letters of reference indicate corresponding parts in all the figures where they occur.

A A are the two frames of the harrow, hinged together at a a and each formed of metal tubing and with the end portions a a, side portions a a and intermediate transverse bars a a. Paris a and. a are coupled together by corner-couplings a and parts a and a by T-couplings a In the further description we will designate parts a and a"cross-bars indiscriminately.

B 3 are the spring-n'ietal teeth, which at their forward end are clamped round one of the-cross-bars, as shown at Z), and carriedback and suitably secured to the next cross-bar.,as

shown at b. The preferable manner of making this second connection is bymaking a loop b in the tooth, a hole b in the cross-bar to tube, inserting theloop in the opening, and running a pin or rod (1 'into the tube to engage the loop. One rod the length of the cross-bar will thus engage the hooks of all the teeth let into the tube. Instead of the loop arrangement, it is evident that a screw D may be employed to unite the tooth at this point. With the screw form the bar is cut out on both sides and the tooth run through, the screw let through the top of the bar and clamped upon the tooth, as shown. When thus attached, the teeth do not extend forward to the next bar, but are shortened, as shown. The short teeth can be used in conncction with the long ones, as shown in Figs. 1 and 2,10 good advantage.

In an application for Letters Patent filed by us on the 19th of November, 1889, Serial No. 330,824, we have shown and claimed harrow-teeth secured in recesses in hollow bars by means of rods passed through the bars beneath the teeth, which, as therein shown, 2. harrow formed of a tubular frame have no loops in them, but are adjustable having teeth with loops upon them inserted through the bars. in openings in one of the tubular framing- 15 Having thus described our invention,what pieces, and a rod or pin passed through the 5 we claim, and desire to secure by Letters Pati tubing and the loop, as set forth.

ent, is In testimony whereof we affix our signa- 1. A barrow having circular hollow crosstnres in presence of two Witnesses. bars and spring-teeth bent round one bar at i HERSOHEL H. HOLLISTER.

their forward ends to form aloose connection I THOMAS H. HULL. lo and extended back and securely connected I Witnesses:

to the next rear bar and then bent into the I A. R. GOULD,

tooth portion, as set forth. 1 F. FULLER. 

